from around the globe are waiting to find out hot next leader will be after the resignation of pope benedict xvi. the rule calls for a 15 to 20- day period before the cop clay begins. it's now possible that the meeting to choose the successor could start sooner than march 15th, the earliest day it could begin. >> the constitution also says this is to allow time for the arrival of all those who may need that time to arrive. however, if all cardinals had already arrived, there would be nobody to wait for. >> reporter: the start of the conclave is of particular importance because of the upcoming holy week that includes palm sunday and easter. the new pontiff would have to be installed by march 17th to have a play. pope ben ticket is holdle holding some of his private audiences on saturday meeting with italian prime minister. the pope's twitter account with 1.5 million followers will go silent the day he retires. >> during the days after the 28th, no tweet will be sent because there is no pope to send it. and, so, when the new pope will be elected, we are going to present to him such an opportun